Increase the size of the data page cache

Increase the size of the data page cache Increase the size of the data page cache and prime all the caches. Data page cacheperformance benefits ofincreasing Cachesperformance benefits of priming

You can increase the size of a database's data page cache, which consists of the data pages kept in memory. When can access a database page from the cache instead of reading it from disk, it can return data much more quickly.

The default size of the data page cache is 1000 pages. In a multi-user environment, or in an environment where the user accesses a lot of data, increase the size of the cache. You configure its size with the derby.storage.pageCacheSize property. For more information about how to set this property and how to estimate memory use, see the " properties" section of the .

can run even with a small amount of memory and even with a small data page cache, although it might perform poorly. Increasing the amount of memory available to and increasing the size of the data page cache may improve performance.

In addition, you might want to prime all the caches in the background to make queries run faster when the user gets around to running them.

These caches include:

The page (user data) cache (described above)
Prime this cache by selecting from much-used tables that are expected to fit into the data page cache.
The data dictionary cache
The cache that holds information stored in the system tables. You can prime this cache with a query that selects from commonly used user tables.
The statement cache
The cache that holds database-specific Statements (including PreparedStatements). You can prime this cache by preparing common queries ahead of time in a separate thread.